Apparatus for burning pulverized coal



G. P. HAYNES APPARATUS FOR BURNING PULVE'RIZED COAL April 2 1, 1931.

3 Sheets-Sheet 1 ATTORNEY Filed'Aug. 10. 1927 Aprilzl, 1931. I 5, p.HAYNES 1,802,111

APPARATUS FOR BURNING PULVERIZED COAL Filed Aug. 10, 1927 3 Sheets-Sheet2 ATTORNEY April 21, 1931. G. P. HAYNES .8

APPARATUS FOR BURNING PULVERIZED COAL Filed Alig. 10, 1927 3Sheets-Sheet '3 3. w 15% z; baa-A IN VENTOR Patented Apr. 21, 1931 1UNITED STATES PATENT OFF f GEORGE r. HAYNES, 0F RR pKL R, NEW YORK,ASSIGNOR 'ro-ronn DRY DOCK ENGINEERING AND REPAIR CORPORATION, OF NEWYORK, N. A CORPORATION on NEW YORK f APPARATUS FOR BURNING PUL'VERIZEDCOAL Application filed August 10, 1927. Serial No. 211,340

-This invention relates to means for burning pulverized coal infurnaces, and-my improvements are directed to a new system wherein afurnace or each of a number thereof serving aScotch or Othertype ofboiler isprovided with a complete unit for at tachment to a furnacefront, each unitincluding a pulverizer, a fan and a prime mover thatdrives said pulverizer and fan; the-furnace front being. adapted tocontrol the delivery of a supplyof heated. air for combustion, and thefan providing an air supply as a vehicle for conveying the powdered coalfrom the pulverizer to the Zone of combustion. Still furthereach unit isadapted for the removable placement of a burner wherewith fluid'fuel maybe used to start the fire or to permit operation either on fluid fuelalone or with both fluid fuel and pulverized coal.

Also my invention comprehends the provision'of controlled means for thecontinuous delivery of comminuted coal into a hopper from which the coalpasses by gravity into the pulverizers forming a part of re- 'spectiveunits.

Other features andv advantages of my invention will hereinafter appeargIn the drawings: H V

Figure 1 is a transverse sectional view of a steamship equipped with myimproved "units and associated parts.

Fig. 3 is an enlarged elevation of a boiler and a single feeding unitZL'PPlIQCT-thETQtO with thehopper shown in section, and

Fig. 4 is an enlarged sectiontaken on the line 4-4 ofjFig. 2. v

In the example of my invention herein illustrated I have indicated asteamship as equipped with a series ofboilers each provided with anumber of furnaces all arranged athwart ship, each furnace having itsown pulverizing and supply unit, all of which are served with comminutedcoal froma common hopperwhich is continuously replenished by conveyermeans.

Thus, in Fig.1 let lindicate the .hull of a steamship, 2 the boilerstherein and 3 the furnaces for said. boilers. Extended across the frontof the boilers, above the furnace fronts, is a hopper 1, and at Oppo:site sides thereof are endless conveyors 5,

' operating Over gears 6 and adapted to d e,

posit in'the hopper comminuted coal which has been dumped intOSthechute7. It will be understood that the coal thus deposited in the hopper isto be distributed therein by suitable trimming means which may be eithermanual orinechanical.

Pendent'from the base of hopper l is a series of vertical tubes 8 eachterminating in a flange 9, and each provided with a control means10,'said tubes being adapted, when the control means are open, todeliver the comminuted coal by gravity from the hopper to respectivepulverizers comprised in the furnace feed units. a In Fig. 2 there isshown in side sectional elevation a furnace front comprisingthe backplate 11 having an annular flange 12 adapted to fit withinfthe forwardportion of the furnace, to which plate 11 is suitably attached, saidplate havinga central opening'13 to coincide with the flared Opening 14-through the, brick which constitutes the fuel entrance into the furnace.

The plate 11 is part of the hollow furnace front, said furnace fronthaving the partially surrounding wall 1'5,inturned flange 16, and innercoeaxia'l walll7, spaced from wall 15, to constitute the heated airsupply space: 18 usual ,with this .type i of, furnace front. Alsotheinner wall 17 is pr ovided with ports 19 for the passage of heatedair to the furnace interiorpto support combustion, and an annular ring'QO, having ports 21 therein is revolubly mounted upon wall 17 to controlthe air supply. Operating means for ring 20 are shown at 20a, Fig. 4.

The elements of the furnace front thus far j described are substantiallyaccording to usual practice and in themselves form no" The in-i part ofmy present improvement. turned flange 16, aifords a base or mount for aplate 22, which is secured thereto by bolts 2221, and provides acomplete front closure means for the heated air space 18. Said plate 22,has an outwardly extending annular flange 23 that projects a certaindistance from the furnace front, and it also has an aperture 24communicating with air supply pace 18, all for purposes to be describedhereinafter,

It will be noted that I have provided a horizontally disposed bracket25, secured as by the bolts 25a to the lower-portion of plate 22, andthus to the furnace front. This bracket serves as a support. upon which;to seat one of my improved fuel supply units in its associated relationwith a furnace front, said unit having. flanges 26 secured as b bolts26a tosaid bracket.

e unit housing 27 is provided with a bearing 28 for an axially disposedhollow shaft 29, and to said shaft-is secured the liubportion30ofaradial pulverizer having the conoidalportion 30a carrying disks 31provided with heaters 32 revoluble within steel linings 33. Each unitpulverizer is provided'with afeed pipe 34, having a flange 35, bywhichit is bolted to the flange 9 of a tube 8, to thereby receive asupply of coal from the hopper 4, the pipe 34 having a delivery end 36directed into the pulverizer and also having an annular flange 37 bywhich it is secured to the housing 27. It will be seen. that the lowerportion of the feed 'pi e 34 is inclined in: a downwardlyforwardidirectionand that the lower wall of said pipe merges into theconoidal central portion 38 over which the pulverizer. rotates.

Secured to the forward end of hub 30is an annular plate 39,, to berotatable therewith, said plate lying in spaced relation to the outlet-40 from thepulverizer, and; said plate carryin a fan. 41 that functionsto pull the powd ered coal fromthe pulverizer. A tube 42, connecting theheated air supply space in the furnace front with the coal feed pipe34', said tube having a control valve 43, permits an air stream to flowthrough the pulverizer as a vehicle for the powdered coal. in responseto the fan opcratiom A deflector 42a extendsat a downward angle intofeed pipe 34,'from the top of the aperture 42b. therein, that connectswith. tube 42 to direct the flow of air toward the pulverizer. The airstream, laden with powdered coal, is delivered whirlingly by the faninto an annular space 44 formed in housing 27, and thence passes, stillwhirling, through a conoidalpassage 45 formed between the for ward. wall46 of housing 27 and an angled ring 47'carriedby plate 39,.continuingfrom said passage into a delivery tube 48, that projects from wall 46,toward the furnace opening 14.

An air Gone 49 having openings 50 there- 'through provided with angledvanes 51, is

slidably mounted on tube 48, said air cone being actuable by manuallyoperable rods 52 in its movement to and from the front plate 18, therebyregulating the admission of air into the furnace from the heated airsupply space 18 to support combustion of the fuel.

Also associated with each unit is a prime mover for revolving shaft athigh speed, and as an example of such prime mover I have shown a steamdriven turbine having theoasing 53 and rotor with blades 55. The casingis represented as connected to the housing by means of brackets 56 whichare secured to the housing by bolts 57, the casing part 58 having an endbearing 28a for shaft 29. The rotor 54 is directly connected to theshaft 29 for its rotation.

Usual means, such as a grid (not shown) in the base of hopper 4 may beprovided for sizing the coal that is permitted to pass by gravity to therespective pulverizers.

At 59 and 60 I have indicated a main pipe line with branches 60a, eachprovided with a control valve 61 for delivering: steam to the respectiveturbines for their operation, and it will be appreciated that by closingthe controls 10 and 61 for one or more of the units a boiler equippedwith a plurality of furnaces can be operated at reduced capacity, suchas for maneuvering purpos s.

' Thesteam exhaust meansis shown at 62, and steam may be returnedtherefrom direct tothe condenser (not shown).

Removably entered through the. hollow shaft 29 is an oil burner 63having anatomizing nozzle 64 that is projected througlnthe delivery tube48, axially thereof, for delivering an oil flame into the furnace, theoil burners-for-each unit being supplied with oil by means of a mainpipe line 65, having branohes'GG forthe respective burners, and a returnline 67, each: branchbeing provided with a control valve 68.

The oil burners are intended primarily for ignition purposes theirflames serving to fire the pulverized coal whenthe turbine is set inmotionand the. pulverizer. operated. Then the oil supply can be shutoff: and the burners removed. Also the oil burners can be operated whena vessel equipped with the'dual coal and oil system is engaged: inmaneuvering and the consumption of fuel is relatively small. Furthermoreas will be understood the oil burning equipment supplementing that forcoal burning in each unit permits operation with whichever form of fuelis most readily available;

Each oil burner is provided with centering devices such as areindicated. at 69, said centering devices beingcarried bv the burner tubeto be removably entered therewith into the hollow shaft 29; Besidesserving to center the burner within the hollow shaft the devices 69,which may have means of 1o a i V where pulver zed coal is intended to beem-' 7 ignition purposes.

anti-frictional relation with said shaft, thereby prevent the high speedrotation of the shaftfrom effecting excessive wear be tween the shaftand burner during the relatively brief periods while the burner is inits operative position for initial heating and It is to be understoodthat while I have herein described andillustrated oilburning means foruse in initially heating a furnace ploye'd as fuel, and for ignitingsuch fuel, my invention is not to be limited thereby as any other liquidor gaseous fuel, in place of oil, may be'employed for such purpose,

7 without departing from the general character of my invention withrespect to the use of pulverized coal as fuel for operating a Scotchboiler.

Variations'within the spirit and scope of my invention are equallycomprehended in the foregoing disclosure.-

I claim: 1. A fuel-pulverizing-feeding unit, for attaohment to afurnaceadapted for the burning of pulverized fuel, comprising a shaft'mounted in bearings carried by said unit, f

r a pulverizer concentrically mounted on said 7 shaft and havmg anlmpact rotor whlch 1s burning pulverized fuel, said furnace hav- Ycarried by said shaft, a feed conduit adapted to supply granular fuel tothe pulverizer, means for supplying regulated quantitiesof pre-heatedair to the fuel in its passage through said conduit and for assistingthe flow thereof, a blower, including a fan mounted on said shaft and ahollow casing surrounding the same, which blower has an inlet connectingwith the outlet of said pulverizer whereby pulverized fuel'is discharged into said blower from the pulverizer, and means for connectingsaid blower with a pulverized fuel burner of a furnace, said unit beingbodily removable from a furnace to which it may be attached andconveniently replaceable by a similar unit when desired.

' 2. The combination with a furnace for ing a hollow front and means forsupplying air thereto, of a fuel pulverizing feeding unit attached tosaid front, said unitcomprising a shaft related axially to said frontand mounted in bearings carried by said unit, a pulverizerconcentricallymounted on said shaft and having an impact rotor V 'WhlCllis carried by said shaft, 'a feed conthe same, which blower has an inlet'connecting with the outlet 'of said pulverizer whereby pulverized fueldischarged into saidblower from the pulverizer, and means for connectingsaid blower with a pulver-' ized fuel burner ofa furnace, said unitbeing bodily removable from a furnace to whichit may be attachedandconveniently replaceable by a similarunit when desired.

Dated, New York, August 2nd, 1927.

, GEORGE PFHAYNES.

